where \(f^h_q(k)\) , \(f^o_q(k)\) , \(f^c_q(k)\)  denotes the multiple semantic outputs of the previous (\(k\) -th) decoder obtained by Eq.(REF ) and Eq.(REF ), respectively. SA denotes Multi-Head Self-Attention operation with Eq.(REF ) [1]} and \(\bar{z}_q^1=\text{SA}(z_q)+\text{SA}(z_q^h)+\text{SA}(z_q^o)\) .
